20765940 has 96 divisors (see below), whose sum is σ = 63598080. Its totient is φ = 5031936.

The previous prime is 20765929. The next prime is 20765957. The reversal of 20765940 is 4956702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61452 + ... + 61788.

It is an arithmetic number, because the mean of its divisors is an integer number (662480).

Almost surely, 2^20765940 is an apocalyptic number.

20765940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20765940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31799040).

20765940 is an abundant number, since it is smaller than the sum of its proper divisors (42832140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20765940 is a wasteful number, since it uses less digits than its factorization.

20765940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20765940 is about 4556.9660959897. The cubic root of 20765940 is about 274.8635797196.

The spelling of 20765940 in words is "twenty million, seven hundred sixty-five thousand, nine hundred forty".